
The 7400-series integrated circuits are a series of digital chips with a
few gates each. The 7420 is a chip with two 4-input NAND gates.

Create a module with the same functionality as the 7420 chip. It has 8
inputs and 2 outputs.

module TopModule (
  input p1a,
  input p1b,
  input p1c,
  input p1d,
  output p1y,
  input p2a,
  input p2b,
  input p2c,
  input p2d,
  output p2y
);

